import java.util.ArrayList;
import java.util.Collection;

public class ApiHomeWork2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(100);
        c.add(200);
        c.add("one");
        c.add("two");
        System.out.println(c);
        System.out.println(c.size());
        System.out.println(c.isEmpty());
        System.out.println(c.contains(100));
        System.out.println('a'+'b'+'c');
    }
}
